The act of cutting off the head of a rat and "neck-fucking" it. The term rattus comes from the latin meaning of the rat family. It is best to masturbate this way in an apartment and/or tenant infected with rats. People do this because the insides (blood and guts) of a rat feel like the next closest thing to a woman's vagina. In Dirty Rattus Masturbating, there is no need to disinfect the rat. If you would like to disinfect the rat, please look up "Sterilized Rattus Masturbating".

"I was staying at a cheep hotel in New York City by myself and took it upon myself to Dirty Rattus Masturbate." (infinitive of Dirty Rattus Masturbation.)